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• WATER QUALITY SAMPLING PROTOCOL <br />Procedure <br />The grotmd water sampling procedure used at the Keenesburg Mine site was <br />approved as part of the Coors Energy Company (CEC) Application for Permit <br />Renewal (1997). CEC began employing this procedure with the fotrrth <br />quarter, 1997 sample collections. (Consent to dispose of Mine Waste Rock <br />at the Keenesburg site resulted in some minor changes to the ground water <br />monitoring plan as approved by Colorado Department of Public Health and <br />Enviromnent (CDPHE). These changes were effected with the 4`h Quarter <br />1998 sampling. However, field collection procedures order of sampling, field <br />measurements, frequency, etc.; all of these protocols remain essentially <br />unchanged.) CEC continues to perform the ground water sampling on a <br />quarterly basis, and tl~e ] 998 analytical laboratory work was completed by <br />Accu-Labs Research, Inc. (Golden, Colorado). <br />• Ground Water Monitoring and Qualit~ysis <br />The formal b~-ound water sampling program for the Keenesburg Mine was <br />initiated in 1992. Ground water quality information has been obtained from <br />monitor wells, located upgradient, within the dishn~bance area and <br />downgradient to the mine site. The monitoring program provides a basis for <br />comparison of information between a baseline and the existing site conditions <br />relative to ground water flow and water quality at the site. <br />The water quality test results, obtained from the data collected in the field and <br />from the analytical ground water quality analyses, continue to suggest that <br />overall groundwater quality in the area has not been adversely impacted by <br />the Keenesburg Mine operation or the current recalmation activities, to <br />include the ash disposal operation. (Since the mine waste rock was only <br />recently introduced to the site (Fall of 1998), its possible impact has yet to be <br />measured.) General b~round water Flow patterns to not appear to have been <br />si~n~ificantly inthienced (or interrupted) by the past mining activity or the <br />current existence of the ash disposal pits. <br /> <br />AHR-1998 -51- Stipulation tt5 <br />